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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m²
kcal/m² hr °C
kcal/hr °C
kcal/m hr °C

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Grey body
Red hot body
Brilliant white polished body
Black body

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Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

Absolute temperature (T)
T
I²
F

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissive power
Absorptive power
Emissivity
Absorptivity

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Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

May increase or decrease depending on temperature
Increases
Decreases
Remain constant

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Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

3
81
9
270

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MORE MCQ ON Heat and Mass Transfer

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